Linux kernel 3.3 has recently been released for public consumption, and it features quite a few new features and improvements. The kernel is the code that developers than build upon to create all the various Linux distributions such as Fedora, Mint, and Arch Linux (among others).
This latest release, version 3.3 includes various improvements to the file system, btrfs, networking, architecture, and EFI BIOS support. In regards to the file system, the Linux 3.3 kernel supports improved balancing and the ability to re-stripe between different RAID (redundant array of independent disks) levels. Further, the kernel will now allow an x86 boot image to be processed by EFI firmware in addition to the traditional BIOS microcode boot that is present in the majority of today’s machines. Also, Kernel 3.3 improves the networking aspects by improving the ability to bond multiple NICs to improve networking throughput and/or to provide redundant connections. Support for a new architecture has also emerged such that Linux kernel will work with Texas Instruments C6X based chips. These chips include the "family of C64x single and multicore DSPs."
The above improvements are just the tip of the iceberg, however. The most talked about new feature is likely going to be the inclusion of Android code from Google’s Android OS project. According to the Kernel Newbies website, the disagreements between Linux kernel developers and Google have been "ironed out," and code from the Android project will now start to be rolled back into the Linux kernel. They expect that Android coming home to traditional Linux will make developing code and end user software easier for everyone, and they expect further Android and Linux integration in the future.
More information on the latest Linux kernel release is available here.